A. Cruise Narrative A.1 Highlights WHP Cruise Summary Information WOCE section designation PR03 Expedition Designation (EXPOCODE) 49RY9111_1 Chief Scientist: Akihiro Kikuchi, Japan Meteorological Agency, 1-3-4, Otemachi, Chiyoda-ku, Tokyo 100, Japan Ship R/V Ryofu Maru Ports of Call Leg 1: Tokyo, Japan to Shimizu, Japan Cruise Dates Leg 1: November 15, 1991 to December 1, 1991 Number of Stations 13 35° 0.00'N Geographical boundaries 143° 57.00'E 144° 4.00'E 23° 8.00'E A.2 Cruise Summary Cruise Track The cruise track and station locations are shown in Figure 1. Observations of PR3 were carried out as part of the R/V Ryofu Maru cruise RY9111 Leg 1. Number of Stations A total of 13 CTD/rosette stations was occupied using a General Oceanics 12 bottle rosette equipped with 12 1.7-liter Niskin water sample bottles, and an NBIS MK III B CTD. No additional sensors were used with the CTD system. Sampling The following water sample measurements were made: salinity, oxygen, nitrate, nitrite and phosphate on all stations. The depths sampled were: 10, 25, 50, 75, 100, 125, 150, 175, 200, 250, 300, 400, 500, 600, 700, 800, 900, 1000,1250, 1500, 2000, 2500, 3000, 4000 in meters. Surface water samples were collected by a bucket at every station. List of Principal Investigators The principal investigators responsible for each parameter measured on the cruise are listed in Table 1. (All the correspondence on these data should be addressed to the Director of the Oceanographical Division, Marine Department, Japan Meteorological Agency.) Table 1. Principal Investigators for all measurements. Name Responsibility Affiliation ----------------------------------------- H. Minami CTD, S JMA/MD K. Fushimi O2, Nutrients JMA/MD JMA/MD Marine Department, Japan Meteorological Agency 2. Measurement Techniques and Calibrations 2.1 CTD The CTD is NBIS Mark III B. An HP9000 Series 300 model 330 (Hewlett Packard) with 4 MByte of memory was used as the primary data collection device and all FSK signals of CTD data were backed up using the digital audio tape (DAT). The original sampling rate is 31.25 samples per second, however, our software gets around 20 samples per second and compress these into one tenth of collected data. The temperature and pressure sensor were calibrated at the calibration facility of HAKUTO Co., Ltd. before the cruise. The results are shown in Table 2. Table 2. CTD Calibration contents at laboratory Temperature; linear fit Time Bias Slope ---------------------------------------------- Pre-Cruise (12 January 1991) +0.1246 0.999874 Pressure(increase); linear fit Time Bias Slope ---------------------------------------------- Pre-Cruise (16 January 1991) -0.8331 1.000787 The conductivity sensor was calibrated at sea using data from the measurements of salinity collected at 4 stations. The salinometer is Guildline Portasal model 8410 for the measurements of salinity of the water samples. We used the batch P112 of IAPSO as standard sea water to calibrate the salinometer. The results are shown in Table 3. The calibration constant is determined assuming that the bias zero. Table 3. The conductivity scaling factor Bias Slope -------------- RY8061-8073 0.0 0.99930 The temperature in "-.SEA" and "-.CTD" files are described with the international temperature scale of 1990 (ITS-90). 2.2 Oxygen Measurements The determination of dissolved oxygen was done by the modified version of the Winkler method described in "Kaiyo Kansoku Shishin (Manual on Oceanographic Observation)" published by the Japan Meteorological Agency(1970). The reagent blank was not subtracted. No estimation of accuracy and precision has been done. Because no temperature data when samples were taken from bottles are recorded, it was assumed that the density of samples is 1022.156 kg/m3 (which assume the temperature for 28 degree C and salinity for 34.68) and use this value to convert from µmol/l to µmol/kg. 2.3 Nutrients Analyses The nutrients analyses were done by the Technicon Auto Analyzer II described in "Kaiyo Kansoku Shishin (Manual on Oceanographic Observation)" published by the Japan Meteorological Agency(1970). No estimation of accuracy and precision has been done. Because no temperature data while analyses are recorded, it was assumed that the density of samples is 1022.156 kg/m3 (which assume the temperature for 28 degree C and salinity for 34.68) and use this value to convert from µmol/l to µmol/kg. 2.4 Noted for the -.SUM, -.SEA and -.CTD files 2.4.1 -.SUM The positions of observation stations were recorded at the beginning and end of the observation and these values were only recorded in minutes, we describe the averaged position as the bottom (BO). Since the surface water samples were taken by a stainless steel water bucket, "Number of bottle" includes this bucket sampling. 2.4.2 -.SEA Our following parameters have the less precision than the required, we describe the last digit of data as blank to meet the data format: CTD temperature, CTD salinity, salinity, oxygen and nitrates. 2.4.4 -.CTD CTD temperature and salinity data have the less precision than the required, we describe the last digit of data as blank to meet the data format. The number of samples averaged at the pressure level was not available because our software was not recording the number of data during data processing. 3. References Japan Meteorological Agency, 1970: Kaiyo Kansoku Shishin (Manual of Oceanographic Observation). (in Japanese) WHPO SIO Data Processing Notes Date Contact Data Type Data Status Summary ------------------------------------------------------------------------ 11/09/01 Uribe CTD New CSV file added CTD data has been converted to exchange format using the new WHPO code. Old file has been put inside the original directory and new file has been put online. 06/08/01 Uribe CTD New CSV file added CTD were put into exchange format and the individual file names were modified. New zipped CTD file has been linked to website. 04/13/01 Uribe BTL CSV file added Bottle file carriage returns were fixed. Bottle file was converted into Exchange format. Website now contains a link to the CSV file. 08/15/00 Bartolacci CTD/BTL Data decrypted As per Masaro Saiki the bottle and CTD files for these cruises have been unencrypted and made public. All index pages have been edited to reflect this change. 08/04/00 Saiki CTD/BTL Data are public I am pleased to inform you that the PIs and participants of the one-time and repeat cruises conducted by the Japan Meteorological Agency's vessels agreed to change most of the data status to public. 09/29/99 Buck CTD/BTL/SUM Online/Encrypted